And end-to-end QoS includes two respects: networks QoS and end-system QoS. With the growth of E-commerce and the increase of HTTP requests, the phenomena of congestion and queueing are more and more serious.

• 电子商务应用的日益发展和HTTP请求的指数性增长造成Web服务器中的拥塞和排队现象越来越严重，仅靠网络QoS机制不可能完全解决端到端的QoS控制问题。